Sodium Zirconium Phosphate Based low Tiermal Expansion Materials : A Review

Srikari Tantri, P and Sheela, K Ramasesha (1998) Sodium Zirconium Phosphate Based low Tiermal Expansion Materials : A Review. Technical Report. National Aerospace Laboratories, Bangalore, India.

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The new family of low thermal expansion materials based zirconium phosphate - NaZr P 0 (NZP) have wide applica- tions in various fields of science 2 snd12 technology. In addition to having the low thermal expansion behaviour they possess good thermal shock and corrosion resistance. R e structural formula for the NZP materials is [M 1 ' ][M quot; ][A2 ][B]01 where M' and M ' are interstitial sites occupied 'by Na or sulstitJtion ions of alkali or alkaline earths or rare earth ions, A and B are lattice sites occupied by Zr and P or other substitution ions like Si, Ti etc. They have a skeletal frameko-rk structure of [Zr P 0 } with rhombo- hedral symmetry of RR space group. The Na+ idns occupy the octa- hedral site of large interstitial space formed by the Zr 2P 0 2 network. This crystal structure gives the flexibility of the substit ution of various ions in the lattice sites. It is possible to get near zero thermal expansion materials and zero thermal expansion anisotropy for wide range of temperatures by tailoring the compo- sitign5, Some13; the NZP materials have good thermal and chemical stability upto 1500 C.13;

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Low Thermal Expansion Materials;Sodium Zirconium Phosphate
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mrs Neetu Chandra
Date Deposited: 10 May 2006
Last Modified: 24 May 2010 04:11

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